Medhat M E, Wang Yifang
Experimental Nuclear Physics Department, Nuclear Research Centre, P.O. 13759, Cairo, Egypt.
Institute of High Energy Physics, CAS, Beijing 100049, China.
Appl Radiat Isot. 2014 Feb;84:13-8. doi: 10.1016/j.apradiso.2013.10.017. Epub 2013 Nov 8.
Monte Carlo simulations are powerful tools used to estimate the background γ-radiation detected by high-resolution gamma-ray spectrometry systems with a HPGe (high purity germanium) detector contained inside a lead shield. The purpose of this work was to examine the applicability of Monte Carlo simulations to predict the optimal lead thickness necessary to reduce the background effect in spectrometer measurements. GEANT4 code was applied to simulate the background radiation spectrum at different thicknesses of lead. The simulated results were compared with experimental measurements of background radiation taken at the same shielding thickness. The results show that the background radiation detected depends on the thickness, size and lining of the shield. Simulation showed that 12 cm lead thick is the optimal shielding thickness.
蒙特卡罗模拟是一种强大的工具，用于估计由置于铅屏蔽体内的HPGe（高纯锗）探测器的高分辨率伽马射线能谱系统所探测到的本底γ辐射。这项工作的目的是检验蒙特卡罗模拟在预测降低能谱仪测量中本底效应所需的最佳铅厚度方面的适用性。应用GEANT4代码来模拟不同铅厚度下的本底辐射谱。将模拟结果与在相同屏蔽厚度下进行的本底辐射实验测量结果进行比较。结果表明，探测到的本底辐射取决于屏蔽体的厚度、尺寸和内衬。模拟显示，12厘米厚的铅是最佳屏蔽厚度。
